
function debounce(fnc, delay = 500) {
  let timer = null;
  return function (arg) {
    if (timer) {
      clearTimeout(timer)
    }
    timer = setTimeout(() => {
      fnc.apply(this, arg)
    }, delay);
  }
}


function pad(str) {
  return ('00' + str).substr(str.length)
}
function formatDate(date, fmt) {
  if (/(y+)/.test(fmt)) {
    fmt = fmt.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length))
  }
  const o = {
    'M+': date.getMonth() + 1,
    'd+': date.getDate(),
    'h+': date.getHours(),
    'mm': date.getMinutes(),
    's+': date.getSeconds()
  }
  for (let k in o) {
    if (new RegExp(`(${k})`).test(fmt)) {
      let str = o[k] + '';
      fmt = fmt.replace(RegExp.$1, (RegExp.$1.length === 1) ? str : pad(str))
    }
  }
  return fmt
}
console.log(formatDate(new Date(), 'yyyy-MM--dd  hh:mm:ss'));
